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Sarandon is urging people to write to Oklahoma Governor Mary Fallin to ask her to intervene.

The 52-year-old prisoner is scheduled to die by lethal injection on September 16 after being convicted of murder.

He was convicted after Justin Sneed, the man who confessed to the killing, claimed Glossip had hired him to do it. Glossip has always maintained his innocence.

In return for his testimony, Sneed was given a prison sentence.

Glossip has now been on death row for 17 years, but has exhausted all options of appeal, including the US Supreme Court.

Governor Fallin has refused to intervene, with Sarandon slamming her for her inaction.

"The governor of Oklahoma is just a horrible person, and a woman, so it's even more discouraging," she said.

"Being tough on crime means being for the death penalty, somehow that got established, so when you're attempting to protect your political career, you can't ever look at the complexities if you want to keep your mantra going."

Sarandon has visited Glossip in prison and has agreed to be his spiritual advisor before his execution.

The 68-year-old actress won an Academy Award for her portrayal of an anti-capital punishment campaigner in the 1995 film Dead Man Walking.